@ARTICLE{Duda_J._A_2013, author={Duda, J.}, volume={61}, number={No 4}, journal={Bulletin of the Polish Academy of Sciences Technical Sciences}, pages={911-918}, howpublished={online}, year={2013}, title={A Lyapunov functional for a neutral system with a time-varying delay}, URL={http://ochroma.man.poznan.pl/Content/83831/PDF/19_paper.pdf}, doi={10.2478/bpasts-2013-0098}, }